基于无线网络的海洋传感数据实时传输系统设计

探索与开发海洋资源对人类有着重大意义,而海洋数据的获取又是探索和开发海洋的前提,如何准确、高效和实时地获取海洋传感数据已成为海洋探测的关键问题。目前用于海洋数据获取和传输的方式主要有有线传输、水声通信、基于移动网络的GPRS通信和卫星通信等方式,但是由于它们各自的局限性,均无法同时满足数据传输的高效率、实时性、低功耗和低成本的要求。文章提出了一套新的数据采集传输系统,基于无线网络的海洋传感数据实时传输系统。水下通过感应耦合方式将部署在水下的海洋传感设备数据进行提取,通过一条包塑钢缆将挂在其上的传感器所采集到的数据依次传输到数据采集板进行处理和存储。水上使用FGR2无线模块组建无线网络,依托FGR2模块高速率、远距离、抗干扰等优势完成数据的实时远距离无线传输。同时,通过FGR2模块组成的无线网络,把所有节点组到一起,网内主节点可以通过网络协议依次获取多个浮标的数据,并可以控制实现海洋传感数据的准确获取与传输,以达到海洋数据获取的实时、高效、低功耗和低成本的目的。     

基于ZigBee的大型公共建筑能耗采集器设计

针对大型公共建筑能耗实时采集系统中存在的布线复杂、通信成本高、安全性低等问题,提出一种基于ZigBee技术的能耗数据采集器设计方案。该方案采用STM32做主控制器, ZigBee采集单元通过RS485接口实现与基于Modbus协议的智能电表之间的数据通信,并采用ZigBee无线网络将数据发送至协调器,协调器通过USART方式与主控制器进行通信;主控制器利用以太网将数据发送至上位机。通过软硬件设计,以XY194E智能电表为例,对其电能参数进行测试采集,结果表明该方案克服了传统人工采集传输的不足,提高了数据采集传输的实时性、准确性,能够满足能耗采集系统的要求。     

基于ZigBee的多点温度采集系统设计与实现

针对广阔空间环境温度采集系统对功耗及成本的要求,设计了基于无线传感网络技术的多点温度采集系统.以CC2430为主控芯片,选用DS18B20作为温度采集节点的传感器,基于ZigBee协议栈构建无线网络实现主从节点之间数据的采集与传输,利用串口通信技术与PC机通信,并编程实现数据处理、存储与显示。     

基于无线网络的城市能耗远程智能管理系统的设计和实现

提出并研究了一个基于现有无线通信网络的城市能源远程智能管理系统的设计和实现。该系统包括无线网络7号信令的研究,以及在能源计量单元上的实现、远程自动抄表、基于B/S的系统设计方案、系统组成、工作原理、功能以及技术性进行了重点论述。该系统通过客户端采集设备采集、验证、整理数据,通过无线网络与服务端设备通信,同时也接受服务端设备的管理。     

基于无线网络的城市能耗远程智能管理系统的设计与实现

提出并研究了一个基于现有无线通信网络的城市能源远程智能管理系统的设计和实现.该系统包括无线网络7号信令的研究,以及在能源计量单元上的实现、远程自动抄表、基于B/S的系统设计方案、系统组成、工作原理、功能以及技术性进行了重点论述.该系统通过客户端采集设备采集、验证、整理数据,通过无线网络与服务端设备通信,同时也接受服务端设备的管理.     

基于6LowPAN的煤矿井下数据传输系统设计

针对煤矿井下现有数据传输系统存在数据传输距离有限、节点部署不便、传感器地址有限、数据传输不及时等问题,设计了一种基于6LowPAN的煤矿井下数据传输系统。该系统采用以太网与6LowPAN协议组合,在数据采集节点预留SPI、RS485等接口实现传感器数据的采集。数据采集节点为无线网络节点,可通过路由系统选取合适的路由路径将传感器数据发送至数据汇聚节点;汇聚节点与边界路由构建有线连接,将数据经以太网上传至地面服务器,从而实现数据的稳定可靠传输。测试结果表明,该系统无论在传输时延、丢包率,还是吞吐量方面都明显优于传统的数据传输系统,可高效、可靠传输煤矿井下数据,具有良好的实时性、较高的通信速率和稳定性。     

基于CVI串口通信在火焰探测中的实现

基于CVI设计了一个用于火焰探测的串口通信系统,该系统采用新的数据传输协议,实现了和下位机四通道数据实时通信的功能,并对接收的数据进行处理、显示和保存等。该系统充分发挥了CVI强大的函数库功能,具有操作简单、方便、界面友好、可扩展性强、成本低和可靠性高的优点。经过电脑仿真测试和实际下位机连接测试,系统可有效抑制传输错误,能实现火焰探测中的串口通信。     

工业现场高维数据采集系统设计

针对工业现场高维光谱数据的高速采集和传输问题,提出了一种高维数据采集系统设计方案。该系统选用TMS320C6713BDSP芯片作为核心处理芯片,选用RTL8019AS作为以太网控制器;采用C语言编程,实现了数据预处理、前端仪器控制以及上位机通信功能;采用LabVIEW开发上位机人机交互界面,较好地实现了高维光谱数据采集功能。现场应用结果表明,该系统有效解决了高维光谱数据的高速采集及传输问题。     

基于GSM的农田气象信息采集节点设计方案

针对传统农田气象信息远程监控系统采集机构布线难、成本高、传输距离有限等不足,提出利用GSM网络覆盖范围广、价格低廉等优势设计的无线网络采集节点方案,阐述无线网络采集节点的硬件构成、通信原理和具体实现方法。实验表明,该设计方案合理可行,能实现农田气象信息的定时采集、稳定传输和实时报警。     

基于移动网络及短距离通讯技术的电表数据采集系统

介绍了电表数据采集系统,它通过工业现场远程抄表集中器,将短距离无线通讯技术和GPRS无线网络通讯技术结合在一起,成功的运用到电力数据远程抄表上,实现了电力数据的实时采集与传输,最后对系统后台软件的设计进行了介绍。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate